Art of manufacturing temperature-equalizing coils.



No. 644,84I. Patnted Ma i 6,1900. r. ALLEN.

ART OF MANUFACTURING TEMPERATURE EQUALIZING BOILS.

(Application filed Nov. 16, 1899.)

(No Model.)

INVENTOH f 7% BY A rom/E rs.

llNITED Snares PATENT Orricn.

FRANK ALLEN, OF NEW YORK, N. Y., ASSIGNOR TO THE ALLEN ICE MACHINE COMPANY, OF SAME PLACE.

ART OF MANUFACTURING TEMPERATURE-EQUALIZING COILS.

SPECIFICATION forming part of Letters Patent No. 644,841, dated March 6, 1900.

Application filed November 16, 1899. Serial No. 737,16 5. (N model.)

To all whom it may concern.- wire I), Fig. 2, is now out to such a length as Be it known that I, FRANK ALLEN, a citizen will permit its being Wound around the tube of the United States, residing at New York, in the proportion of about one convolution to in the borough of Brooklyn and State of New each lineal foot of the tube a, as shown in 55 York, have invented certain new and useful Fig. 3. Of course the wire may be previously Improvements in the Art of Manufacturing wound in helical shape, as shown in Fig. 2, Temperature-Equalizing Ooils, of which the and then placed over the tube a. A larger following is a specification. piece of straight tubing 0, Fig. 4, is now pro- This invention relates to the art of manuvided and the same placed over the wire- 60 I0 facturing temperatnre-equalizing coils for wound tube a. The wire should be of such heating or cooling purposes generally and thickness that it corresponds to one-half the which are especially applicable to ammonia difference between the internal diameter of andother refrigerating machines. the outer tube 0 and the external diameter of The object of the invention is to produce the inner tube a, or approximately so, so that 65 I5 such coils of the desired size quickly, conthe tubes can beplaced over one another, with veniently, and inexpensively. the wire serving as a separating medium, af- The invention consists of certain successive fording a neat fit and practically maintainsteps to be hereinafter described and then ing the concentricity of the tubes. The exclaimed. terior tube 0 is made of somewhat less length 7e In the accompanying drawings, Figure 1 is than the inner tube, so that the said inner an elevation of a straight metallic tube which tube extends at both ends beyond the exteis adapted to form the inner coil of the artirior tube. A suitable bending-machine is cle to be made. Fig. 2 is an elevation of a now used for the purpose of bending the sohelically-coiled wire which is to be placed assembled parts, causing them to assume the 75 over said tube. Fig. 3is an elevation of said shape shown in Fig. 5, with alternate bends tube wound with said wire. Fig. 4 is an elea at the ends of the straight portions. Bevation showing a straight outer tube placed fore bending the tubes and inclosed spacingoverthesaid parts,part of the outertube being wire the portions to be bent are sufiiciently broken away, so as to show the parts inside. heated to soften them, for if bent cold they 80 0 Fig. 5 is an elevation of a temperature-equalwill crack or break. The headers shown in izing coil made after my method, part of the dotted lines are then attached. In the case outer tube being broken away and Fig. 6 is of forming a coil of helical shape the tubes an enlarged transverse section of one length are bent into such shape by means of a difierof the coil. ent bending-machine. Any of the machines 85 Similar letters of reference indicate come on the market adapted for bending tubing sponding parts. may of course be used.

Referring to Fig. 5, the temperature-equal- The advantage incident to this method of izing coil is shown to consist of an interior building u pand forminga temperature-equaltube a, a helically-wound wire I), wrapped or izing coil is that the separating-wire 1) serves 0 4o placed around the same, and an exterior tube as an interposed mandrel or anvil medium a, fitting snugly over the wire-wound tube a, to preserve the concentricity of v the tubes this construction being carried out throughthroughout their bends or sinuosities, as ab out the sinuosities of the coil and from end to solutely no collapsing or shifting of the tubes end, the inner tube extending at both ends one against the other can take place, result- 5 beyond the outer tube, so that the well-known ing, therefore, in a temperature equalizing headers (shown in dotted lines) may be apcoil Without joints and which at the same plied without communicating with the inner time is very simple and easily made at a slight tube. a cost of manufacture.

In making the described temperature- Having thus described my invention, what fee equalizing coil a straight length of tubing a, I claim as new, and desire to secure by Letters Fig. 1, is cut off to the required length. A Patent, is-- tube and Wire within another tube, then heating the parts of the tubes to be bent, and finally bending the said parts at their heated portions, so as to form the sinuosities of the coil, substantially as set forth.

In testimony that I c1airn the foregoing as my invention I have signed name in presence of two subscribing wi 'ses.

FR K ALLEN.

VVit-nesses:

PAUL GoEPEL, M. H. WURTZEL. 

